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    SubjectRe: [rfc 6/6] dma-remap: double the default DMA coherent pool size
    On Sun, Mar 01, 2020 at 04:05:27PM -0800, David Rientjes wrote:
    > When AMD memory encryption is enabled, some devices may used more than
    > 256KB/sec from the atomic pools. Double the default size to make the
    > original size and expansion more appropriate.
    >
    > This provides a slight optimization on initial expansion and is deemed
    > appropriate for all configs with CONFIG_DMA_REMAP enabled because of the
    > increased reliance on the atomic pools.
    >
    > Alternatively, this could be done only when CONFIG_AMD_MEM_ENCRYPT is
    > enabled.

    Can we just scale the initial size based on the system memory size?

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